Multilayered, flat shaped part with a visible side and a support layer

Abstract

A multilayer flat molding with a visible side and a supporting layer, for example bathtubs or shower fittings, is described, the visible side consisting of a polyurethane surface coating layer and the supporting layer consisting of a reinforced polyurethane layer.

What is claimed is: 
     
       1. A multilayer, flat molding having a visible side and a supporting layer, said visible side consisting of a polyurethane layer that has been obtained by curing a first mixture containing: a1) surface coating polyisocyanates based on 1,6-diisocyanatohexane and/or isophorone diisocyanate having a viscosity of 100 to 10,000 mPa·s and an NCO content of 5 to 30 wt. %,   b1) a polyester and/or polyether having a viscosity of 200 to 5000 mPa·s and an OH group content corresponding to an OH number of 33 to 1000,   c1) optionally, conventional pigments, fillers, additives and catalysts, as well as   d1) optionally, solvents in amounts of at most 5 wt. %,   and the supporting layer consisting of a polyurethane layer that has been obtained by curing a second mixture containing   a2) semi-prepolymers based on diphenylmethane diisocyanate and a polyether polyol having an NCO content of 20 to 30 wt. %,   b2) polyether polyols having an OH number of 250 to 400, and   c2) 10 to 60 wt. % based on said second mixture, of reinforcing fillers and/or fibers.   
     
     
       2. A molding according to claim 1, wherein the component a1) contains a biuret based on 1,6-diisocyanatohexane in an amount of 10 to 60 wt. % based on said component a1). 
     
     
       3. A molding according to claim 1, wherein said molding is in the form of a shower fitting. 
     
     
       4. A molding according to claim 1, wherein the layer forming the visible side is 0.2 to 0.7 mm thick. 
     
     
       5. A molding according to claim 1, wherein said molding is in the form of a bathtub. 
     
     
       6. A process of producing moldings comprising the steps of: a) applying a polyurethane layer that has been obtained by curing a first mixture to a mold to form a visible side of said molding; said first mixture containing i) surface coating polyisocyanates based on 1,6-diisocyanatohexane and/or isophorone diisocyanate having a viscosity of 100 to 10,000 mPa·s and an NCO content of 5 to 30 wt. %,   ii) a polyester and/or polyether having a viscosity of 200 to 5000 mPa·s and an OH group content corresponding to an OH number of 33 to 1000,   iii) optionally, conventional pigments, fillers, additives and catalysts, as well as   iv) optionally, solvents in amounts of at most 5 wt. %;     b) applying a supporting layer consisting of a polyurethane layer that has been obtained by curing a second mixture containing i) semi-prepolymers based on diphenylmethane diisocyanate and a polyether polyol having an NCO content of 20 to 30 wt. %,   ii) polyether polyols having an OH number of 250 to 400, and   iii) 10 to 60 wt. % based on said second mixture, of reinforcing fillers and/or fibers.